Staging: batman-adv: fix rogue packets on shutdown

On module shutdown batman-adv would purge the internal packet
queue by sending all remaining packets which could confuse
other nodes. Now, the packets are silently discarded.

Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 15 insertions, 9 deletions

diff --git a/drivers/staging/batman-adv/send.c b/drivers/staging/batman-adv/send.c
index d8536e277a2..ac69ed871a7 100644
--- a/drivers/staging/batman-adv/send.c
+++ b/drivers/staging/batman-adv/send.c
@@ -440,6 +440,9 @@ void send_outstanding_bcast_packet(struct work_struct *work)
         hlist_del(&forw_packet->list);
         spin_unlock_irqrestore(&forw_bcast_list_lock, flags);
 
+        if (atomic_read(&module_state) == MODULE_DEACTIVATING)
+                goto out;
+
         /* rebroadcast packet */
         rcu_read_lock();
         list_for_each_entry_rcu(batman_if, &if_list, list) {
@@ -453,15 +456,15 @@ void send_outstanding_bcast_packet(struct work_struct *work)
 
         forw_packet->num_packets++;
 
-        /* if we still have some more bcasts to send and we are not shutting
-         * down */
-        if ((forw_packet->num_packets < 3) &&
-            (atomic_read(&module_state) != MODULE_DEACTIVATING))
+        /* if we still have some more bcasts to send */
+        if (forw_packet->num_packets < 3) {
                 _add_bcast_packet_to_list(forw_packet, ((5 * HZ) / 1000));
-        else {
-                forw_packet_free(forw_packet);
-                atomic_inc(&bcast_queue_left);
+                return;
         }
+
+out:
+        forw_packet_free(forw_packet);
+        atomic_inc(&bcast_queue_left);
 }
 
 void send_outstanding_bat_packet(struct work_struct *work)
@@ -476,6 +479,9 @@ void send_outstanding_bat_packet(struct work_struct *work)
         hlist_del(&forw_packet->list);
         spin_unlock_irqrestore(&forw_bat_list_lock, flags);
 
+        if (atomic_read(&module_state) == MODULE_DEACTIVATING)
+                goto out;
+
         send_packet(forw_packet);
 
         /**
@@ -483,10 +489,10 @@ void send_outstanding_bat_packet(struct work_struct *work)
          * to determine the queues wake up time unless we are
          * shutting down
          */
-        if ((forw_packet->own) &&
-            (atomic_read(&module_state) != MODULE_DEACTIVATING))
+        if (forw_packet->own)
                 schedule_own_packet(forw_packet->if_incoming);
 
+out:
         /* don't count own packet */
         if (!forw_packet->own)
                 atomic_inc(&batman_queue_left);